1 public interface ActionProxy {
 2
 3     /**
 4      * Called after all dependencies are set
 5      */
 6     void prepare() throws Exception;
 7
 8     /**
 9      * @return the Action instance for this Proxy
10      */
11     Object getAction();
12
13     /**
14      * @return the alias name this ActionProxy is mapped to
15      */
16     String getActionName();
17
18     /**
19      * @return the ActionConfig this ActionProxy is built from
20      */
21     ActionConfig getConfig();
22
23     /**
24      * Sets whether this ActionProxy should also execute the Result after executing the Action
25      *
26      * @param executeResult
27      */
28     void setExecuteResult(boolean executeResult);
29
30     /**
31      * @return the status of whether the ActionProxy is set to execute the Result after the Action is executed
32      */
33     boolean getExecuteResult();
34
35     /**
36      * @return the ActionInvocation associated with this ActionProxy
37      */
38     ActionInvocation getInvocation();
39
40     /**
41      * @return the namespace the ActionConfig for this ActionProxy is mapped to
42      */
43     String getNamespace();
44
45     /**
46      * Execute this ActionProxy. This will set the ActionContext from the ActionInvocation into the ActionContext
47      * ThreadLocal before invoking the ActionInvocation, then set the old ActionContext back into the ThreadLocal.
48      *
49      * @return the result code returned from executing the ActionInvocation
50      * @throws Exception
51      * @see ActionInvocation
52      */
53     String execute() throws Exception;
54
55     /**
56      * Sets the method to execute for the action invocation. If no method is specified, the method provided by
57      * in the action's configuration will be used.
58      *
59      * @param method the string name of the method to invoke
60      */
61     void setMethod(String method);
62
63     /**
64      * Returns the method to execute, or null if no method has been specified (meaning "execute" will be invoked)
65      */
66     String getMethod();
67
68 }  

package org.caijieru.web.struts2.action;import com.opensymphony.xwork2.ActionSupport;/***@authorcaijieru*@version1.0*/
publicclass LoginAction extends ActionSupport{private String userName;private String password;private String msg; //结果信息属性/***@returnthemsg*/public String getMsg() {returnmsg;}/***@parammsgthemsgtoset*/publicvoid setMsg(String msg) {this.msg = msg;}/***@returntheuserName*/public String getUserName() {returnuserName;}/***@paramuserNametheuserNametoset*/publicvoid setUserName(String userName) {this.userName = userName;}/***@returnthepassword*/public String getPassword() {returnpassword;}/***@parampasswordthepasswordtoset*/publicvoid setPassword(String password) {this.password = password;}/***处理用户请求的excute()方法*@return结果导航字符串*@throwsException*/public String execute() throws Exception{if("test".equals(this.userName) &&
"test".equals(this.password)){msg = "登录成功，欢迎" + this.userName;returnthis.SUCCESS;}else{msg = "登录失败，用户名或密码错";returnthis.ERROR;}}
}

public String execute() throws Exception{if("test".equals(this.userName) && "test".equals(this.password)){msg = "登录成功，欢迎" + this.userName;//获取ActionContext实例，通过它来访问Servlet APIActionContext context = ActionContext.getContext();//看session中是否已经存放了用户名，如果存放了：说明已经登录了；
//否则说明是第一次登录成功if(null != context.getSession().get("uName")){msg = this.userName + "：你已经登录过了!!!";}else{context.getSession().put("uName", this.userName);}returnthis.SUCCESS;}else{msg = "登录失败，用户名或密码错";returnthis.ERROR;}}

Struts2中通过ActionContext来访问Servlet API，让Action彻底从Servlet API 中分离出来，最大的好处就是可以脱离Web容器测试Action。